docs: def check_global_attributes(self, ds):
          """
          Check all global NC attributes for existence.
  
          :param netCDF4.Dataset ds: An open netCDF dataset
          """
          return [
              self._has_attr(ds, 'acknowledgement', 'Platform Sponsor'),
              self._has_attr(ds, 'publisher_email', 'Station Publisher Email'),
              self._has_attr(ds, 'publisher_email', 'Service Contact Email', BaseCheck.MEDIUM),
              self._has_attr(ds, 'institution', 'Service Provider Name', BaseCheck.MEDIUM),
              self._has_attr(ds, 'publisher_name', 'Service Contact Name', BaseCheck.MEDIUM),
              self._has_attr(ds, 'Conventions', 'Data Format Template Version', BaseCheck.MEDIUM),
              self._has_attr(ds, 'publisher_name', 'Station Publisher Name', BaseCheck.HIGH),
          ]